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I have no idea. But I have asked somebody to try to find out, so maybe we will have an answer tomorrow.
Sorry, nobody I asked knew the answer. It is not something that is seen on signs, so I guess only the guys building the track knows the gradient.
Somebody found out in some documents that the maximum legal gradient on stations on the Holmenkollen line is 4%. So that means that it is at least not any steeper than that.